How to display the GDPR popup using the template of the demo site?
The GDPR template used on the demo site https://demo.storejextensions.org/gdpr is the 'Center modal block' theme with the 'Extended' variant enabled. Obviously you have to enable required categories for the specific use case of your website.
To enable this layout it's enough to choose the following settings:
Finally enable one by one up to 4 categories of cookies, based on your needs: